I have a transmission fluid change question. My trans has about 200,000 miles now and it is an automatic. I gotten it used with 100,000 miles. I have changed the fluid once in between the two mileages and i have been told if i flush it it will damage it causing it to fail. Can is do a simple fluid change and filter for an automatic with this amount of mileage or should i continue to drive it with the fluid in it now until it goes?